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It's well known that over-doses of paracetamol (acetaminophen) damage the liver, often fatally, but now it appears that even therapeutic doses alter the results of liver function tests. I was interested to read this because some years ago my wife had liver function tests performed by the GP and the results were abnormal. I repeated the tests a week or two later using a different lab and later did them again with a third lab; both gave normal results.

I assumed that the first result had been an error but now it seems likely that the initial abnormal results were due to paracetamol, which my wife had been taking quite often at the time for frequent headaches.